Irradiation effects on magnetic properties in reactor pressure vessel steel

l"hod"cti0U The magnnic mcthads using hynererir loop and Barkhamen noise technique haw the poten!ial possibility to evaluate the radiation damage of nuclear reactor p r r m ves5el (RPV) steel [I]. However, underlying mechanism of magnetic properties change under imadiation is not available yet la thb shldy it is tried to show the underlying mechanism of the varialion of hFtemis dmp and Badhaurcn noise in RPV steel which was irradiated to the various dose by nNtmn and p m beam.